Strain sensor using fiber bragg grating interrogation

This research aims to focus on analyzing a novel design of strain sensor using Fiber Bragg Grating (FBG) interrogation. Studies on fiber optic sensors reported have mainly focused on FBG wavelength-based monitoring method by using optical spectrum analyzers (OSA). Although FBG has better strain sens...

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Main Author:	Abd Rahim, Mohd Shahrir
Format:	Thesis
Language:	English English English
Published:	2020
Subjects:	TA1501-1820 Applied optics Photonics
Online Access:	http://eprints.uthm.edu.my/392/1/24p%20MOHD%20SHAHRIR%20ABD%20RAHIM.pdf http://eprints.uthm.edu.my/392/2/MOHD%20SHAHRIR%20ABD%20RAHIM%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/392/3/MOHD%20SHAHRIR%20ABD%20RAHIM%20WATERMARK.pdf
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id	my-uthm-ep.392
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spelling	my-uthm-ep.3922021-07-25T02:15:42Z Strain sensor using fiber bragg grating interrogation 2020-01 Abd Rahim, Mohd Shahrir TA1501-1820 Applied optics. Photonics This research aims to focus on analyzing a novel design of strain sensor using Fiber Bragg Grating (FBG) interrogation. Studies on fiber optic sensors reported have mainly focused on FBG wavelength-based monitoring method by using optical spectrum analyzers (OSA). Although FBG has better strain sensitivity measurement, however there have some restriction to monitor by using OSA. The usage of OSA are very costly, bulky and has slow scanning speed. Therefore, research is conducted to design and construct a fully portable, low-cost and low-powered interrogator which is specifically designed to read FBGs within the C-band. An optical strain sensor utilizing reflected light of FBG as input to sagnac loop filter (SLF) is experimentally demonstrated in this work. The proposed SLF has been employed for intensity interrogation of FBG strain sensor where the polarization maintaining fiber (PMF) serves as an edge filter. By monitoring the optical power changes, it is feasible to obtain information that permits strain measurement with a simple and low-cost structure. This work resulted in four milestones. The first is the successful characteristic of strain sensor using FBG 1550nm wavelength. Then, the SLF is characterized using ASE. The output spectrum of SLF is a comb filter and has free spectrum range of 15nm. After that, laser scanning of SLF using TLS is demonstrated. It shows that the optical power is greater than 900μW while the value of R-squared is 0.9931. Finally, by using OSA, the wavelength peak shifts from 1550.088nm to 1550.252nm when the strain changes from 0 to 1000 2020-01 Thesis http://eprints.uthm.edu.my/392/ http://eprints.uthm.edu.my/392/1/24p%20MOHD%20SHAHRIR%20ABD%20RAHIM.pdf text en public http://eprints.uthm.edu.my/392/2/MOHD%20SHAHRIR%20ABD%20RAHIM%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/392/3/MOHD%20SHAHRIR%20ABD%20RAHIM%20WATERMARK.pdf text en validuser mphil masters Universiti Tun Hussein Onn Malaysia Fakulti Kejuruteraan Elektrik dan Elektronik
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	TA1501-1820 Applied optics Photonics
spellingShingle	TA1501-1820 Applied optics Photonics Abd Rahim, Mohd Shahrir Strain sensor using fiber bragg grating interrogation
description	This research aims to focus on analyzing a novel design of strain sensor using Fiber Bragg Grating (FBG) interrogation. Studies on fiber optic sensors reported have mainly focused on FBG wavelength-based monitoring method by using optical spectrum analyzers (OSA). Although FBG has better strain sensitivity measurement, however there have some restriction to monitor by using OSA. The usage of OSA are very costly, bulky and has slow scanning speed. Therefore, research is conducted to design and construct a fully portable, low-cost and low-powered interrogator which is specifically designed to read FBGs within the C-band. An optical strain sensor utilizing reflected light of FBG as input to sagnac loop filter (SLF) is experimentally demonstrated in this work. The proposed SLF has been employed for intensity interrogation of FBG strain sensor where the polarization maintaining fiber (PMF) serves as an edge filter. By monitoring the optical power changes, it is feasible to obtain information that permits strain measurement with a simple and low-cost structure. This work resulted in four milestones. The first is the successful characteristic of strain sensor using FBG 1550nm wavelength. Then, the SLF is characterized using ASE. The output spectrum of SLF is a comb filter and has free spectrum range of 15nm. After that, laser scanning of SLF using TLS is demonstrated. It shows that the optical power is greater than 900μW while the value of R-squared is 0.9931. Finally, by using OSA, the wavelength peak shifts from 1550.088nm to 1550.252nm when the strain changes from 0 to 1000
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Abd Rahim, Mohd Shahrir
author_facet	Abd Rahim, Mohd Shahrir
author_sort	Abd Rahim, Mohd Shahrir
title	Strain sensor using fiber bragg grating interrogation
title_short	Strain sensor using fiber bragg grating interrogation
title_full	Strain sensor using fiber bragg grating interrogation
title_fullStr	Strain sensor using fiber bragg grating interrogation
title_full_unstemmed	Strain sensor using fiber bragg grating interrogation
title_sort	strain sensor using fiber bragg grating interrogation
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Kejuruteraan Elektrik dan Elektronik
publishDate	2020
url	http://eprints.uthm.edu.my/392/1/24p%20MOHD%20SHAHRIR%20ABD%20RAHIM.pdf http://eprints.uthm.edu.my/392/2/MOHD%20SHAHRIR%20ABD%20RAHIM%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/392/3/MOHD%20SHAHRIR%20ABD%20RAHIM%20WATERMARK.pdf
_version_	1747830599394000896

Strain sensor using fiber bragg grating interrogation

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